Annual Accounts vs Company Tax Return UK: What Is the Difference?

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If you run a limited company in the UK, you will usually hear about annual accounts and a Company Tax Return, and although the two are closely connected and are often prepared from the same bookkeeping records, they are not the same thing and they are filed for different purposes.

In simple terms, annual accounts are mainly about reporting your company’s financial position to Companies House, while the Company Tax Return is about calculating and reporting your company’s taxable profit and Corporation Tax position to HM Revenue & Customs (HMRC). Understanding this difference is important because a limited company normally has to deal with both.

What are annual accounts?

Annual accounts, also called statutory accounts, are financial statements prepared at the end of your company’s financial year. They are prepared from your company’s accounting records and normally show information such as the company’s balance sheet, profit and loss, and relevant notes. Depending on the company’s size and circumstances, there may also be a directors’ report and an auditor’s report.

The purpose of annual accounts is to give Companies House, shareholders and other relevant users a picture of the company’s financial position and performance. Small, micro-entity and dormant companies may be entitled to use simpler accounts, but they still have reporting obligations.

You can read more about What Are Micro Entity Accounts? if you want to understand how the rules can be simpler for qualifying small companies.

What is a Company Tax Return?

A Company Tax Return is the return a company uses to tell HMRC about its Corporation Tax position. It normally consists of the CT600 form, supplementary pages where required, the company accounts and tax computations.

The important point is that the profit shown in your accounts is not necessarily the same as the profit on which Corporation Tax is calculated. When preparing the Company Tax Return, adjustments may be required to arrive at the company’s taxable profit, because some accounting expenses are treated differently for Corporation Tax purposes.

For example, a company might show an accounting profit of £50,000, but its taxable profit could be different after tax adjustments, such as adding back certain non-deductible expenses or making appropriate claims for capital allowances.

What is the main difference between annual accounts and a Company Tax Return?

The easiest way to understand the difference is to think about who receives the information and what they need it for.

Annual accounts are filed with Companies House and are primarily concerned with reporting the company’s financial information. The Company Tax Return is submitted to HMRC and is concerned with calculating and reporting the company’s Corporation Tax liability.

The two documents are therefore connected, but they have different purposes.

Annual accounts	Company Tax Return
Filed with Companies House	Filed with HMRC
Reports the company’s financial position	Reports the company’s Corporation Tax position
Based on accounting records	Based on the accounts plus tax adjustments
Includes financial statements	Includes CT600, tax computations and accounts
Used for statutory reporting	Used to calculate Corporation Tax
Normally due 9 months after year end for a private company	Normally due 12 months after the Corporation Tax accounting period ends

Do annual accounts and the Company Tax Return use the same figures?

They usually start with the same underlying accounting records, and the accounts are normally included with the Company Tax Return, but the final taxable profit does not necessarily equal the accounting profit.

This is one of the reasons why simply taking the profit from your accounts and applying the Corporation Tax rate is not always enough. A Corporation Tax computation needs to consider the relevant tax rules and make the necessary adjustments.

HMRC specifically explains that the profit or loss used for Corporation Tax is different from the profit or loss shown in the annual accounts.

Can the same annual accounts be used for Companies House and HMRC?

Yes, in many cases the same underlying statutory accounts are used for both purposes, although the filing process and information required by each organisation are different.

For example, an accountant may prepare the company’s year-end accounts and then use those accounts as the starting point for preparing the Corporation Tax computation and CT600.

HMRC explains that a Company Tax Return is made up of the CT600, supplementary pages where applicable, company accounts and tax computations.

This is why business owners sometimes think that filing the accounts with Companies House automatically deals with Corporation Tax, but it does not.

If I file my annual accounts, do I still have to file a Company Tax Return?

Yes. Filing annual accounts with Companies House does not normally remove the requirement to submit a Company Tax Return to HMRC.

A company that has received a notice to deliver a Company Tax Return has a legal obligation to submit one, even if the company has made a loss or has no Corporation Tax to pay.

This is an important distinction because some company directors assume that submitting accounts to Companies House means everything has been reported to HMRC, when in reality the two filing obligations remain separate.

When are annual accounts due?

For an ordinary private limited company, annual accounts are normally due at Companies House nine months after the end of the company’s financial year. The first accounts are different and are normally due within 21 months of incorporation for a private company.

For example, if your company’s financial year ends on 31 March 2026, the normal Companies House filing deadline would be 31 December 2026.

You should not leave the preparation of the accounts until the final few days, because you need enough time to check the bookkeeping, reconcile the bank accounts, deal with outstanding information and prepare the financial statements before filing.

When is the Company Tax Return due?

The normal deadline for filing a Company Tax Return is 12 months after the end of the Corporation Tax accounting period.

There is also a separate deadline for paying Corporation Tax. For most companies with taxable profits below the large-company threshold, Corporation Tax is normally due nine months and one day after the end of the accounting period.

For example, if your Corporation Tax accounting period ends on 31 March 2026, the normal Corporation Tax payment deadline is 1 January 2027, while the Company Tax Return filing deadline is 31 March 2027.

This means that you normally have to pay the Corporation Tax before the Company Tax Return itself is due.

Why are the deadlines different?

The deadlines are different because Companies House and HMRC have separate legal reporting requirements.

For a normal established private limited company, the annual accounts are generally due nine months after the financial year end, while the Company Tax Return is normally due 12 months after the end of the Corporation Tax accounting period.

This creates a useful practical point for company directors: do not confuse the Companies House accounts deadline with the HMRC tax return deadline.

If you want a more detailed explanation of the different dates, you can also read Limited Company Tax Deadlines and Limited Company Accounts Cost in the UK.

What happens if my company has no Corporation Tax to pay?

You may still have to file a Company Tax Return.

HMRC states that a company must still send a Company Tax Return if it is required to do so even where the company has made a loss or has no Corporation Tax to pay.

Similarly, a dormant company normally still has to file annual accounts with Companies House each year, although its Corporation Tax obligations can be different depending on whether HMRC considers it dormant for Corporation Tax purposes.

Therefore, “no tax to pay” does not automatically mean “nothing to file.”

What is a CT600?

The CT600 is the main form used for a Company Tax Return.

It contains information used by HMRC to establish the company’s Corporation Tax position, but it is not simply another version of the annual accounts. The CT600 is accompanied by the company’s accounts and tax computations as part of the Company Tax Return.

If you want to understand the CT600 in more detail, see What Is a CT600 Form?.

Can annual accounts and the Company Tax Return be filed together?

They can sometimes be filed together using suitable software, but they are still two different reporting obligations and are submitted to two different bodies.

From 1 April 2026, HMRC’s previous online service for filing company accounts and Company Tax Returns was closed, and companies generally need to use commercial software to file Company Tax Returns with HMRC. Companies House accounts can still be filed through the available Companies House filing methods.

So even where your accountant prepares everything as one year-end job, it is useful to understand that the work ultimately covers both Companies House reporting and HMRC Corporation Tax reporting.

What happens if I miss the annual accounts deadline?

Companies House can charge a penalty if your accounts are filed late.

For a private limited company, the penalty starts at £150 for accounts filed up to one month late, increasing to £375, £750 and £1,500 depending on how late the accounts are. The penalty can also be doubled if accounts are filed late for two consecutive years.

There can also be more serious consequences if a company repeatedly fails to meet its filing obligations, including the possibility of the company being struck off the register.

What happens if I miss the Company Tax Return deadline?

HMRC can charge a late filing penalty when a Company Tax Return is filed after its deadline, even if the company does not owe any Corporation Tax.

This is another reason why a company with no tax liability should not simply assume that it can ignore the Company Tax Return.

The Corporation Tax payment deadline and the Company Tax Return filing deadline should also be treated separately because you can incur consequences for paying tax late even when your tax return itself is filed on time.

Is the annual accounts deadline the same as the Corporation Tax deadline?

No. This is one of the most important points for a limited company director to remember.

For a typical private limited company, annual accounts are normally due to Companies House nine months after the financial year end, Corporation Tax is normally due to HMRC nine months and one day after the end of the Corporation Tax accounting period, and the Company Tax Return is normally due 12 months after the end of that accounting period.

So there are effectively three important dates to keep in mind:

1. Annual accounts deadline – normally 9 months after the financial year end.
2. Corporation Tax payment deadline – normally 9 months and 1 day after the Corporation Tax accounting period ends.
3. Company Tax Return deadline – normally 12 months after the Corporation Tax accounting period ends.

What is the difference between annual accounts and a company tax return in simple terms?

The simplest way to remember it is that annual accounts tell Companies House what happened financially in your company, while the Company Tax Return tells HMRC how much taxable profit your company has made and how much Corporation Tax it owes.

Your accountant will normally use the same bookkeeping records to prepare both, but the accounts and the tax return are not interchangeable.

If you run a UK limited company, keeping these two obligations separate in your mind can make your filing responsibilities much easier to understand, particularly when you are checking deadlines, reviewing your accountant’s work or trying to understand why the profit shown in your accounts is different from the taxable profit used for Corporation Tax.

In short: annual accounts are not the same as a Company Tax Return, and filing one does not automatically mean that you have filed the other.

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